Popped in the vets on Fri, and they had a new product on the counter - it is called Vet Aquadent and is a product you put in pets water bowls to help plaque forming. Not particularly cheap, £6.66 for a 250ml bottle, but thought I would give it a go, as they all hate Logic Gel. They are happily drinking it, I just need to try it in Kizzy's water bowl now. IT is a green liquid, but doesn't smell. IT does seem to have only been out a couple of weeks.